<html>
 <head>
   <title>事件流</title>
   <meta charset="utf-8">
   <script src="js/event.js"></script>
   <script src="js/script.js"></script>
   <body>
      <div id="box">
         <input type="button" value="按钮" id="btn" onclick="showMes()">
         <input type="button" value="按钮2" id="btn2">
         <input type="button" value="按钮3" id="btn3">
         <a href="event.html" id="go">跳转</a>
      </div>
   </body>
 </head>